If I was buying new lights with a 'money no object' basis, I'd be going for Ayups. If money is an issue, I'd be buying what I already have:
THESE. I have two of them and they are plenty bright enough to light up the road ahead on unlit country lanes, so that I can see where I'm going as well as be seen. One of the things I've found useful is to have a light on my lid. Ok, I look like a prize dork, BUT, it's great for BEING SEEN BY, and since I started using this, it made a noticeable difference as to how quickly on-coming motorists dipped their lights - also useful for illuminating road signs, and when waiting at junctions, scanning in each direction to get me seen.